@Article{opine,
author = {Ana-Maria Popescu and Oren Etzioni},
title = {Extracting Product Features and Opinions from Reviews},
journal = {Proceedings of HLT-EMNLP},
year = {2005}
}

@Article{lexrank,
author = {G\"{u}ne\c{s} Erkan and Dragomir R. Radev},
title = {LexRank: Graph-based Centrality as Salience in Text Summarization},
journal = {Journal of Artificial Intelligence Research},
year = {2004}
}

@Article{porter,
author = {M. F. Porter},
title = {An algorithm for suffix stripping},
journal = {Program},
volume = {14},
number = {3},
pages = {130-137},
month = {July},
year = {1980}
}